Update README.md

Author: Chuxel

README.md

@@ -28,7 +28,11 @@ You can either:
 
 #### Can I just reuse an existing Docker configuration?
 
-Absolutley! At its simplest, all you need to do is add a `.vscode/devContainer.json` file to your project and reference the `Dockerfile` or `docker-compose.yml`. The intent of `devContainer.json` is conceptually similar to VS Code's `launch.json` for debugging, but designed to launch (or attach to) your development container instead.
+Absolutley! If you want to use an existing Dockerfile as a starting point, run **Remote-Docker: Create Container Configuraton File...** from the command pallette (Cmd/Ctrl+Shift+P). You'll be prompted to select a Dockerfile or you can opt to use a base image instead.
+
+##### About `.vscode/devContainer.json`
+
+The intent of `devContainer.json` is conceptually similar to VS Code's `launch.json` for debugging, but designed to launch (or attach to) your development container instead. At its simplest, all you need to do is add a `.vscode/devContainer.json` file to your project and reference the `Dockerfile` or `docker-compose.yml`. 
 
 Since you are here, check out the [Existing Dockerfile](containers/docker-existing-dockerfile) and [Existing Docker Compose](containers/docker-existing-docker-compose) definitions for details, but here's the a quick tour of the basic properties. If you have a `Dockerfile`, set these properties: